<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>菜鸟教程(runoob.com)</title>
    <style>
      #myDIV {
        margin: auto;
        border: 1px solid black;
        width: 200px;
        height: 100px;
        background-color: coral;
        color: white;
        -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
        animation: mymove 5s infinite;
      }

      /* Chrome, Safari, Opera */
      @-webkit-keyframes mymove {
        50% {
          -webkit-transform: rotate(180deg);
        }
      }

      /* Standard syntax */
      @keyframes mymove {
        50% {
          transform: rotate(180deg);
        }
      }
    </style>
  </head>
  <body>
    <p>DIV 元素的旋转 180 度:</p>
    <p></p>
    <div id="myDIV">
      <h1>myDIV</h1>
    </div>

    <p>transform 属性支持动画效果。</p>
    <p><b>注意：</b>Internet Explorer 9 及更早 IE 版本不支持 CSS 动画。</p>
  </body>
</html>
